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# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
from openstack.object_store import object_store_service
from openstack import resource
class BaseResource(resource.Resource):
service = object_store_service.ObjectStoreService()
#: Metadata stored for this resource. *Type: dict*
metadata = dict()
_custom_metadata_prefix = None
_system_metadata = dict()
def _calculate_headers(self, metadata):
headers = dict()
for key in metadata:
if key in self._system_metadata:
header = self._system_metadata[key]
else:
header = self._custom_metadata_prefix + key
headers[header] = metadata[key]
return headers
def set_metadata(self, session, metadata):
url = self._get_url(self, self.id)
session.post(url, endpoint_filter=self.service,
headers=self._calculate_headers(metadata))
def delete_metadata(self, session, keys):
url = self._get_url(self, self.id)
headers = {key: '' for key in keys}
session.post(url, endpoint_filter=self.service,
headers=self._calculate_headers(headers))
def _set_metadata(self):
self.metadata = dict()
headers = self.get_headers()
for header in headers:
if header.startswith(self._custom_metadata_prefix):
key = header[len(self._custom_metadata_prefix):].lower()
self.metadata[key] = headers[header]
def get(self, session, include_headers=False, args=None):
super(BaseResource, self).get(session, include_headers, args)
self._set_metadata()
return self
def head(self, session):
super(BaseResource, self).head(session)
self._set_metadata()
return self
@classmethod
def update_by_id(cls, session, resource_id, attrs, path_args=None):
"""Update a Resource with the given attributes.
:param session: The session to use for making this request.
:type session: :class:`~openstack.session.Session`
:param resource_id: This resource's identifier, if needed by
the request. The default is ``None``.
:param dict attrs: The attributes to be sent in the body
of the request.
:param dict path_args: This parameter is sent by the base
class but is ignored for this method.
:return: A ``dict`` representing the response headers.
"""
url = cls._get_url(None, resource_id)
headers = attrs.get(resource.HEADERS, dict())
headers['Accept'] = ''
return session.post(url, endpoint_filter=cls.service,
headers=headers).headers
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